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Avalanche Forecast

Archived

Apr 4th, 2015–Apr 5th, 2015

Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

Little Yoho.

Less snow is expected West of the divide in Little Yoho.  If more snow spills over into this region, the hazard may rise beyond the moderate rating.  Ski quality should be improved.

Weather Forecast

An additional 5-10cm will spill over to the Little Yoho region Saturday night as an intense upslope storm deposits much more east of the continental divide.  These will be associated with light SE winds Sunday and freezing levels to valley bottom.

Snowpack Summary

5-10 cm of recent snow overlies a prominent rain crust from March 28th. The mid layering and base of the snowpack is well settled in the forecast area of Little Yoho. Some recent snow has been redistributed by M-S winds earlier this week and these resultant wind slabs are buried in the alpine at ridge top and cross-loaded gulley features.

Avalanche Summary

No new avalanches reported in this area today.

Confidence

Forecast snowfall amounts are uncertain on Saturday

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.

Loose Dry

Loose Dry avalanches are the release of dry unconsolidated snow and typically occur within layers of soft snow near the surface of the snowpack. These avalanches start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-dry avalanches include point-release avalanches or sluffs.